f2fs: code cleanup by removing ifdef macro surrounding
Define f2fs_listxattr and to NULL when CONFIG_F2FS_FS_XATTR is not enabled, then we can remove many ugly ifdef macros in the code. Signed-off-by: Chengguang Xu <cgxu519@mykernel.net> Reviewed-by: Chao Yu <yuchao0@huawei.com> Signed-off-by: Jaegeuk Kim <jaegeuk@kernel.org>
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